IP-POSPHY4 Altera, IP-POSPHY4 Datasheet - Page 115

• Manufacturer Part Number: IP-POSPHY4
• Description: IP CORE - POS-PHY Level 4 SPI 4.2 Interface
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IP-POSPHY4

• Software Application: IP CORE, Interface And Protocols, COMMUNICATION
• Supported Families: Arria GX, Cyclone, HardCopy, Stratix
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: POS-PHY Level 4 Interface, Link-Layer/PHY Layer
• License: Initial License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Appendix A: Start-Up Sequence
Troubleshooting
December 2010 Altera Corporation
Issues and Tips—Miscellaneous
7. Receiver (particularly third-party receivers) detects protocol errors related to burst
8. Throughput is lower than expected. The following tips may prove useful:
Miscellaneous unexpected behavior:
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length. The following tips may prove useful:
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Ensure all clocks are up and operating at their specified frequencies.
Ensure all resets have been asserted, and released only after clock stabilization.
Ensure all signals connected to the MegaCore function are driven or sampled with
the appropriate clock.
Ensure all parameters are set as specified.
If the transmitter is an embedded address variation, ensure that bursts are
written into the FIFO buffer in multiples of ctl_td_burstlen, or eop
terminated.
Ensure that ctl_td_burstlen is less than the buffer size.
Understand quantization effects and choose transmitter mode (lite or non-lite),
data path width, and clock frequencies appropriate for your packet size and
throughput needs.
Ensure all clocks are operating at their specified frequencies.
Ensure transmitter queue(s) always has data, otherwise factor into expectation.
Ensure receiver queue(s) always has space, otherwise factor into expectation.
Ensure status is sent or received as expected, which includes checking
stat_ts_sync, stat_td_holb, ctl_ts_status_mode, ctl_ry_fifostatoverride,
ctl_ry_ae and ctl_ty_af.
Ensure credits (ctl_td_mb1 and ctl_td_mb2) are large enough that they do not
run out between status updates.
POS-PHY Level 4 MegaCore Function User Guide
A–5